Volvo s80 water in transmission

I have a Volvo s80 that appears to have developed a transmission problem at 75k miles. The Volvo dealer says oil from the transmission is normally piped around the radiator to cool but this time has, somehow, mingled with the water. Anyone ever heard of this before? Quoting £4000 for a new transmission here! Would a flush and new radiator work?

thanks - this option is still going to hurt (volvo quote the transmission fluid at £10 a litre, so a couple of flushes could be £150!) Still, better than any £4k option.. thanks - this option is still going to hurt (volvo quote the transmission fluid at £10 a litre, so a couple of flushes could be £150!) Still, better than any £4k option..

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check the colour of the transmission oil --it should be bright colour and not smell burnt
run the fault codes as it may be engine sensor problems or TCM problems
Unless the timing belt has been changed ,it is 20.000 miles overdue for a belt change ( big money repair)
( volvos s60 --30.l,s80/t63.0l/3.2l, v703.2l, xc60/t63.0l/3.2l,xc70/t63.0l/3.2l, xc90 3.2l) all run timing chains
Have an independent inspector check the vehicle over

parts tore can say for sure but its usually in pints..4 pints to a quart..so 16 pints is 4 qts most take 6 qts or 24 pints..just to give you an idea..put 2/3rd of it in and start the car fill to level according to the stick.

Your vehicle's engine requires oil meeting GM Standard GM6094M. You should look for and use only an oil that meets GM Standard GM6094M. SAE 5W-30 is best for your vehicle.The best Brand is 5W-30, Mobile 1 synthetic oil, but you can use Castrol GTX 5W-30, too. It is very important to use only one barand of engine oil.When the CHANGE ENGINE OIL SOON message in the Driver Information Center (DIC) comes on, means that an oil change service is required for your vehicle.If the engine oil life system is ever reset accidentally, you must service an oil change for your vehicle within 3,000 miles (5 000 km), or three months wichever comes first, since your last service.The maintenace tune ups for this car are scheduled at 25K, 50K, 75K, 100K and so on.Dealer recomend to change the transmission oil and filter at Maintenace II, at 50K, and the air filter too. Use only DEXRON®-VI Automatic Transmission Fluid.The dealer sugest to flush the radiator every 75K and use 50/50 mixture with distilled water, and use only DEX-COOL. I recommend to flush every 50K.

you should take to the dealer the can properly diagnose and repair with proper parts.may just be due for service.
the transmissions on that model use very specific fluids in each unit.so generic oils will not due.
furthermore the cost of replacement for the trans is very high in just labor alone. not trying to scare you or promote a dealer just saying it needs factory attension with factory tools